What part of Jamaica are you going to? I went to Ocho Rios and did do the horse back riding where they take you in the ocean and you hold on bareback while they swim. This was nice and it was worth the money. You dont go near any stables they put you out in a riding arena and bring the horses out to you and put you on them there, and then ride through the land they have and go through some park like settings away from any hay and barns so you should be ok! I cant be around hay/straw/shavings to long or I cant breathe but I did fine! Hope this helps and you can enjoy!